Sec. 2318. Wall Framing. The framing of exterior and interior walls shall be in accordance with provisions specified in Section 2326 unless a specific design is furnished.. Wood stud walls and bearing partitions shall not support more than two floors and a roof unless an analysis satisfactory to the building official shows that shrinkage of the wood …

UL recently tested and promulgated a listing for a new two-hour load bearing wood-frame wall assembly containing pressure impregnated fire-retardant-treated wood (FRTW), a move that makes it quicker and easier for building officials to approve plans for Type III construction.